1. A wireless ground sensing vehicle detection device comprises a vehicle detector and a ground sensing coil, and is characterized in that:

the device also comprises a trigger device, wherein the trigger device is arranged in the edge area of the road surface, is used for sensing the pressure from the wheels, triggers when being subjected to the pressure of the wheels, and sends out a trigger signal when being triggered;

the first detector is used for being buried in the middle area of a road surface and comprises a shell and a first sensor arranged on the shell, the first sensor is used for detecting whether a vehicle is arranged above the first sensor, and when the vehicle is arranged above the first sensor, the first sensor outputs a first level signal; when no vehicle is arranged above the first sensor, the first sensor outputs a second level signal;

the ground induction coil is buried in the middle area of a road surface and used for inducing whether vehicles pass through the ground induction coil from the top or not, the ground induction coil, the feeder line and the capacitor in the vehicle detector form an LC oscillation circuit, and the LC oscillation circuit is connected with and controlled by the vehicle detector; the triggering device is connected with and controlled by the vehicle detector; the first detector is connected with and controlled by a vehicle detector;

the triggering device, the ground induction coil and the first detector are sequentially arranged on the road along the advancing direction of the vehicle, and a distance exists between the triggering device and the ground induction coil, so that the triggering device is far away from the magnetic field range of the ground induction coil; the first detector is also spaced from the ground induction coil such that the first detector is away from the magnetic field range of the ground induction coil.

2. The wireless ground-sensing vehicle detection device of claim 1, wherein: the second detector is connected with and controlled by the vehicle detector, the second detector is used for being buried in the middle area of a road surface, the second detector is positioned behind the first detector, the second detector comprises a shell and a second sensor arranged on the shell, the second sensor is used for detecting whether a vehicle is arranged above the second detector, and when the vehicle is arranged above the second detector, the second sensor outputs a third level signal; the second sensor outputs a fourth level signal when there is no vehicle above it.

3. The wireless ground-sensing vehicle detection device of claim 2, wherein: the first sensor and the second sensor are infrared sensors or distance sensors.

4. The wireless ground-sensing vehicle detection device of claim 1, wherein: the one end of ground sense coil is equipped with the switch element, be connected with the wire jumper on each circle layer of ground sense coil, during each wire jumper parallel access LC oscillating circuit, the switch element is equipped with on each wire jumper, the switch element is connected and is controlled by the vehicle detector, vehicle detection device still includes magnetic field sensor, magnetic field sensor installs in ground sense coil's magnetic field scope, magnetic field sensor connects and is controlled by the car and allies oneself with the detector.

5. The wireless ground-sensing vehicle detection device of claim 1, wherein: the trigger device is in a strip shape and comprises an upper shell and a lower shell, the bottom edge of the upper shell is inwards bent to form a curled edge, the top edge of the lower shell is inwards bent to form a curled edge, an annular elastic ring is arranged between the upper curled edge and the lower curled edge along the circumferential direction of the trigger device, the top surface and the bottom surface of the elastic ring are respectively bonded and fixed with the curled edge of the upper shell and the curled edge of the lower shell through waterproof glue, the upper shell and the lower shell are separated by the elastic ring to form a vertical movable space between the upper curled edge and the lower shell, a plurality of vertical connecting bolts are arranged on the inner side of the elastic ring along the circumferential direction of the trigger device, the lower ends of the connecting bolts are fixedly connected with the curled edge of the lower shell, through holes are arranged on the curled edge of the upper shell, the upper ends of the connecting bolts penetrate through holes, bolt heads are arranged at the upper ends of the connecting bolts, a trigger switch is arranged in the lower shell, and an ejector rod is arranged in the upper shell, the ejector rod is aligned with the trigger switch.

6. The wireless ground-sensing vehicle detection device of claim 5, wherein: an annular inner sealing ring is arranged between the elastic ring and the connecting bolt along the circumferential direction of the triggering device, the inner sealing ring is of a membrane structure, the top surface and the bottom surface of the inner sealing ring are respectively in sealing bonding with the turned edge of the upper shell and the turned edge of the lower shell, a first magnet is arranged at the bottom of the upper shell, a second magnet is arranged at the top of the lower shell, and the first magnet and the second magnet repel each other.

7. The wireless ground-sensing vehicle detection device of claim 1, wherein: the vehicle detector comprises a main control module, and further comprises a dial switch, a wireless communication module, a storage module, an oscillation circuit, a storage module and a power management module which are connected with the main control module.

8. A wireless ground sensing vehicle detection method is characterized by comprising the following steps:

s1, arranging a trigger device in front of the ground induction coil, and arranging a first detector behind the ground induction coil;

s2, when the trigger device is triggered by the vehicle, the ground induction coil is started to detect the vehicle; when a vehicle passes through the ground induction coil, the triggering device is triggered again, the first vehicle detector is started, and the number of the vehicles is detected through the first detector;

and S3, when the trigger device is not triggered again after a period of time, the control ground induction coil stops working.

9. The wireless ground-sensing vehicle detection method of claim 8, wherein: in step S1, a second probe is further provided behind the first probe; in S2, when the vehicle passes through the ground induction coil, the triggering device is triggered again, the first detector and the second detector are activated, the number of vehicles is detected by the first detector, and the moving speed of the vehicle and the length of the vehicle are calculated according to the distance between the first detector and the second detector and the time point when the vehicle passes through the first detector and the second detector.

10. The wireless ground-sensing vehicle detection method of claim 8, wherein: the triggering device is arranged in front of the ground induction coil, the detector is arranged behind the ground induction coil, the magnetic field intensity of the surrounding environment of the ground induction coil is detected, the detection result is compared with the triggering magnetic field intensity of the ground induction coil with different numbers of turns calibrated in advance, when the detection result is close to the triggering magnetic field intensity of the ground induction coil, the number of turns of the ground induction coil is changed, and the triggering magnetic field intensity of the ground induction coil is switched to a higher gear.

Background

In the intelligent parking lot industry, the vehicle detector believes that people do not feel strange, and can be divided into an annular coil type vehicle detector, an ultrasonic sensing vehicle detector, a radar detection vehicle detector, a video detection vehicle detector and the like according to different application technologies.

Among these, the toroidal coil type vehicle detector should be most applied. The vehicle detector can calculate parameters such as vehicle flow, speed, vehicle length and the like according to the magnetic field change.

In an intelligent parking lot system, a ground sensing vehicle detector mainly plays a role in triggering to detect whether vehicles exist on a lane or not. The ground-sensing vehicle detector is mature in technology, easy to install and low in cost, so that the ground-sensing vehicle detector is widely applied to the parking lot industry.

However, the ground-sensing vehicle detector is also insufficient, that is, the traffic flow is large, when the distance between vehicles is small, the head of the rear vehicle and the tail of the front vehicle may be simultaneously in the sensing range of the ground-sensing coil, that is, the rear vehicle interferes with the detection of the front vehicle, the detection precision is reduced at this time, and the number of passing vehicles cannot be accurately detected.

Disclosure of Invention

In view of the disadvantages of the prior art, an object of the present invention is to provide a wireless ground-sensing vehicle detection apparatus and method, which can accurately detect the number of passing vehicles even when the vehicle distance is short.

In order to achieve the purpose, the invention provides the following technical scheme:

a wireless ground sensing vehicle detection device comprises a vehicle detector, a ground sensing coil and a trigger device, wherein the trigger device is arranged in the edge area of a road surface and is used for sensing the pressure from wheels, triggering when the pressure of the wheels is applied, and sending a trigger signal when the trigger device is triggered; the first detector is used for being buried in the middle area of a road surface and comprises a shell and a first sensor arranged on the shell, the first sensor is used for detecting whether a vehicle is arranged above the first sensor, and when the vehicle is arranged above the first sensor, the first sensor outputs a first level signal; when no vehicle is arranged above the first sensor, the first sensor outputs a second level signal; the ground induction coil is buried in the middle area of a road surface and used for inducing whether vehicles pass through the ground induction coil from the top or not, the ground induction coil, the feeder line and the capacitor in the vehicle detector form an LC oscillation circuit, and the LC oscillation circuit is connected with and controlled by the vehicle detector; the triggering device is connected with and controlled by the vehicle detector; the first detector is connected with and controlled by a vehicle detector; the triggering device, the ground induction coil and the first detector are sequentially arranged on the road along the advancing direction of the vehicle, and a distance exists between the triggering device and the ground induction coil, so that the triggering device is far away from the magnetic field range of the ground induction coil; the first detector is also spaced from the ground induction coil such that the first detector is away from the magnetic field range of the ground induction coil.

As a preferable scheme: the second detector is connected with and controlled by the vehicle detector, the second detector is used for being buried in the middle area of a road surface, the second detector is positioned behind the first detector, the second detector comprises a shell and a second sensor arranged on the shell, the second sensor is used for detecting whether a vehicle is arranged above the second detector, and when the vehicle is arranged above the second detector, the second sensor outputs a third level signal; the second sensor outputs a fourth level signal when there is no vehicle above it.

As a preferable scheme: the first sensor and the second sensor are infrared sensors or distance sensors.

As a preferable scheme: the one end of ground sense coil is equipped with the switch element, be connected with the wire jumper on each circle layer of ground sense coil, during each wire jumper parallel access LC oscillating circuit, the switch element is equipped with on each wire jumper, the switch element is connected and is controlled by the vehicle detector, vehicle detection device still includes magnetic field sensor, magnetic field sensor installs in ground sense coil's magnetic field scope, magnetic field sensor connects and is controlled by the car and allies oneself with the detector.

As a preferable scheme: the trigger device is in a strip shape and comprises an upper shell and a lower shell, the bottom edge of the upper shell is inwards bent to form a curled edge, the top edge of the lower shell is inwards bent to form a curled edge, an annular elastic ring is arranged between the upper curled edge and the lower curled edge along the circumferential direction of the trigger device, the top surface and the bottom surface of the elastic ring are respectively bonded and fixed with the curled edge of the upper shell and the curled edge of the lower shell through waterproof glue, the upper shell and the lower shell are separated by the elastic ring to form a vertical movable space between the upper curled edge and the lower shell, a plurality of vertical connecting bolts are arranged on the inner side of the elastic ring along the circumferential direction of the trigger device, the lower ends of the connecting bolts are fixedly connected with the curled edge of the lower shell, through holes are arranged on the curled edge of the upper shell, the upper ends of the connecting bolts penetrate through holes, bolt heads are arranged at the upper ends of the connecting bolts, a trigger switch is arranged in the lower shell, and an ejector rod is arranged in the upper shell, the ejector rod is aligned with the trigger switch.

As a preferable scheme: an annular inner sealing ring is arranged between the elastic ring and the connecting bolt along the circumferential direction of the triggering device, the inner sealing ring is of a membrane structure, the top surface and the bottom surface of the inner sealing ring are respectively in sealing bonding with the turned edge of the upper shell and the turned edge of the lower shell, a first magnet is arranged at the bottom of the upper shell, a second magnet is arranged at the top of the lower shell, and the first magnet and the second magnet repel each other.

As a preferable scheme: the vehicle detector comprises a main control module, and further comprises a dial switch, a wireless communication module, a storage module, an oscillation circuit, a storage module and a power management module which are connected with the main control module.

A wireless ground-sensing vehicle detection method, comprising the steps of:

s1, arranging a trigger device in front of the ground induction coil, and arranging a first detector behind the ground induction coil;

s2, when the trigger device is triggered by the vehicle, the ground induction coil is started to detect the vehicle; when a vehicle passes through the ground induction coil, the triggering device is triggered again, the first vehicle detector is started, and the number of the vehicles is detected through the first detector;

and S3, when the trigger device is not triggered again after a period of time, the control ground induction coil stops working.

As a preferable scheme: in step S1, a second probe is further provided behind the first probe; in S2, when the vehicle passes through the ground induction coil, the triggering device is triggered again, the first detector and the second detector are activated, the number of vehicles is detected by the first detector, and the moving speed of the vehicle and the length of the vehicle are calculated according to the distance between the first detector and the second detector and the time point when the vehicle passes through the first detector and the second detector.

As a preferable scheme: the triggering device is arranged in front of the ground induction coil, the detector is arranged behind the ground induction coil, the magnetic field intensity of the surrounding environment of the ground induction coil is detected, the detection result is compared with the triggering magnetic field intensity of the ground induction coil with different numbers of turns calibrated in advance, when the detection result is close to the triggering magnetic field intensity of the ground induction coil, the number of turns of the ground induction coil is changed, and the triggering magnetic field intensity of the ground induction coil is switched to a higher gear.

Compared with the prior art, the invention has the advantages that: the vehicle detection device is characterized in that a trigger device is arranged in front of a ground induction coil, a detector is arranged behind the ground induction coil, whether a vehicle approaches the ground induction coil or not is detected through the trigger device, the distance between the vehicles is judged, the ground induction coil is started when the vehicle approaches the ground induction coil, and the detector is started to detect the number, the moving speed and the length of the vehicle when the distance between the vehicles is too close, so that the interference of a rear vehicle to a front vehicle is avoided, and the detection accuracy is ensured; when the distance between vehicles is far, only the ground induction coil is started, so that the detection accuracy can be ensured, and the aim of saving electricity can be fulfilled; in addition, when no vehicle approaches the ground induction coil for a long time, the ground induction coil automatically sleeps, so that more electricity is saved; the vehicle detection device can also realize the self-adaptive adjustment of the vehicle detection device to the environmental magnetic field, and expand the application range of the vehicle detection device.

Drawings

FIG. 1 is a schematic configuration diagram of a vehicle detecting device according to a first embodiment;

FIG. 2 is a schematic layout of a vehicle detection system according to a first embodiment;

FIG. 3 is a schematic structural diagram of a ground induction coil according to a first embodiment;

FIG. 4 is a schematic structural diagram of a triggering device according to a first embodiment;

fig. 5 is a schematic circuit diagram of a vehicle detection device according to a first embodiment.

Reference number 1, ground induction coil; 2. a vehicle detector; 3. a trigger device; 301. an upper housing; 302. a lower housing; 303. curling; 304. a through hole; 305. a connecting bolt; 306. an elastic ring; 307. an inner seal ring; 308. a first magnet; 309. a second magnet; 310. a trigger switch; 311. a top rod; 4. a first detector; 5. a first sensor; 6. a second detector; 7. a second sensor; 8. a vehicle; 9. a lane; 10. a magnetic field sensor; 11. a jumper wire; 12. a switch unit.

Detailed Description

Referring to fig. 1, a wireless ground sensing vehicle detection device includes a vehicle detector 2, a ground sensing coil 1, a triggering device 3, and a first probe 4.

The trigger device 3 is strip-shaped, the trigger device 3 is arranged in the edge area of the road surface and used for sensing the pressure from the wheels, and triggers when the pressure of the wheels is applied, and a trigger signal is sent out when the trigger device 3 is triggered.

The first detector 4 is used for being buried in the middle area of a road surface, the first detector 4 comprises a shell and a first sensor 5 arranged on the shell, the first sensor 5 is used for detecting whether a vehicle is arranged above the first sensor 5, and when the vehicle is arranged above the first sensor 5, the first sensor 5 outputs a first level signal; when there is no vehicle above it, the first sensor 5 outputs a second level signal.

The ground induction coil 1 is buried in the middle area of a road surface and used for inducing whether a vehicle passes from the top or not.

The ground induction coil 1, the feeder line and the capacitor in the vehicle detector 2 form an LC oscillation circuit, and the signal output end of the LC oscillation circuit is connected with the signal input end of the vehicle detector 2; the signal output end of the trigger device 3 is connected with the signal input end of the vehicle detector 2; the signal output of the first detector 4 is connected to the signal input of the vehicle detector 2.

Referring to fig. 2, the triggering device 3, the ground induction coil 1, and the first probe 4 are sequentially installed on the road in the traveling direction of the vehicle. A distance exists between the trigger device 3 and the ground induction coil 1, so that the trigger device 3 is far away from the magnetic field range of the ground induction coil 1; there is also a distance between the first detector 4 and the ground sensing coil 1 such that the first detector 4 is far from the magnetic field range of the ground sensing coil 1.

The working principle of the vehicle detection device is as follows:

in an initial state (i.e. after the triggering device 3 is not triggered for a period of time), the vehicle detector 2 controls the ground induction coil 1 and the first detector 4 to sleep, so as to achieve the effect of saving power.

When the wheel pressure of the vehicle reaches the trigger device 3 during the running of the vehicle, the trigger device 3 sends a trigger signal to the vehicle detector 2, the vehicle detector 2 receives the trigger signal and then controls the ground induction coil 1 to be started, the LC oscillating circuit starts to output an oscillating signal with the frequency f0 to the vehicle detector 2, when the vehicle passes through the area above the ground induction coil 1, the magnetic field intensity in the ground induction coil 1 is changed, the inductance L of LC oscillation is reduced, the oscillating frequency is increased, the vehicle detector 2 starts to detect the change of the oscillating frequency of the ground induction coil 1, when the oscillating frequency is increased to f1, the vehicle detection module judges that the vehicle passes through the ground induction coil 1, and when the vehicle drives out of the magnetic field range of the ground induction coil 1, the oscillating frequency is recovered to f 0.

After the current vehicle passes through the ground induction coil 1, the vehicle detector 2 starts timing, and if the trigger device 3 is not triggered within a subsequent certain time, the vehicle controller controls the ground induction coil 1 to sleep.

When a vehicle passes above the ground induction coil 1, the triggering device 3 is triggered again, which indicates that the distance between the rear vehicle and the front vehicle is too small, the head of the rear vehicle and the tail of the front vehicle may be located in the magnetic field range of the ground induction coil 1 at the same time, which may cause inaccurate detection of the number of vehicles, and at this time, the first detector 4 of the controller of the vehicle detector 2 is started. First sensor 5 in this embodiment is infrared sensor, infrared sensor's probe is up, when infrared sensor's top is sheltered from by vehicle chassis, it outputs high level signal to vehicle detector 2, when infrared sensor's top is not sheltered from, it outputs low level signal to vehicle detector 2, vehicle detector 2 judges through the level signal change of first sensor 5 output that there are several cars to pass through ground sensing coil 1, the quantity of the vehicle that detects this moment uses the detection result of first detector 4 as the standard, can guarantee the accuracy that vehicle quantity detected.

When a vehicle passes through the ground induction coil 1 and the trigger device 3 is not triggered subsequently, it is indicated that a rear vehicle close to a front vehicle does not exist, the rear vehicle does not interfere with the front vehicle, and the vehicle detector 2 controls the first detector 4 to sleep so as to achieve the purpose of saving power. At this time, the number of passing vehicles, the moving speed of the vehicle, and the vehicle length can be accurately detected only by the ground induction coil 1.

The vehicle detection device in this embodiment further includes a second detector 6, where the second detector 6 is used to be buried in a middle area of a road surface, and the second detector 6 is located behind the first detector 4 (i.e., when the vehicle moves forward, the vehicle will travel to the detection area of the first detector 4 first and then to the detection area of the second detector 6). The second detector 6 comprises a shell and a second sensor 7 arranged on the shell, the second sensor 7 is used for detecting whether a vehicle is arranged above the second detector, and when the vehicle is arranged above the second detector, the second sensor 7 outputs a third level signal; when there is no vehicle above it, the second sensor 7 outputs a fourth level signal. The signal output of the second detector 6 is connected to the signal input of the vehicle detector 2.

The second sensor 7 in this embodiment is also an infrared sensor with its probe facing upwards.

When the distance between the rear vehicle and the front vehicle is very short, the vehicle detector 2 controls the first detector 4 and the second detector 6 to be started simultaneously, when the vehicle passes above the first detector 4 and the second detector 6, level signals output by the first detector 4 and the second detector 6 sequentially change, the moving speed of the vehicle can be accurately calculated through the distance between the first detector 4 and the second detector 6 and the time point when the vehicle passes through the first detector 4 and the second detector 6, and the length of the vehicle can be accurately calculated according to the moving speed of the vehicle and the time point when the vehicle head approaches the first detector 4 and the vehicle tail is far away from the first detector 4.

Considering that the magnetic field in the surrounding environment of the ground induction coil 1 is superposed with the magnetic field of the ground induction coil 1, the change of the magnetic field intensity in the ground induction coil 1 is caused, and further the inductance of the ground induction coil 1 is influenced, the interference may cause the oscillation frequency of the ground induction coil 1 to approach the frequency f1, thereby causing the misjudgment of the vehicle detector 2, and causing the detection result to be inaccurate.

In order to avoid the above situation, referring to fig. 3, in the present embodiment, a switch unit 12 is installed at one end of the ground induction coil 1, a jumper wire 11 is connected to each coil layer of the ground induction coil 1, each jumper wire 11 is connected in parallel to the LC oscillating circuit, and the switch unit 12 is installed on each jumper wire 11. The vehicle detector 2 can change the number of turns of the ground induction coil 1 connected into the LC oscillating circuit by controlling the on/off of each switch unit 12.

According to the oscillation frequency calculation formula f ═ 1/{2 pi √ (LC) }, when the area and material of the ground induction coil 1 are not changed, the inductance L can be adjusted by changing the number of turns of the ground induction coil 1, so that the oscillation frequency of the oscillation circuit is changed.

The vehicle detection device in the present embodiment further includes a magnetic field sensor 10, and the magnetic field sensor 10 is installed in the magnetic field range of the ground induction coil 1. As shown in fig. 2, the magnetic field sensor 10 is preferably installed in the central region of the ground coil 1.

The signal output of the magnetic field sensor 10 is connected to the signal input of the vehicle detector 2. The magnetic field intensity of the ground induction coil 1 with different turns is detected and calibrated before the vehicle detector 2 is arranged on the road surface. The method specifically comprises the following steps: through in inserting the coil of different turns into LC oscillation circuit, detect magnetic field intensity (promptly initial magnetic field intensity) when no vehicle passes through ground induction coil 1 and the magnetic field intensity (promptly trigger magnetic field intensity) when having the vehicle to pass through ground induction coil 1 through magnetic field sensor 10, trigger magnetic field and test many times and get the average value), can obtain the initial magnetic field intensity of ground induction coil 1 when different turns and trigger magnetic field intensity to data storage that will survey is to vehicle detector 2.

After the vehicle detection device is installed on a road, after the initialization of the vehicle detection device is completed by electrifying, the vehicle detector 2 controls the magnetic field sensor 10 to start to detect the environmental magnetic field intensity in the area of the ground induction coil 1, and if the environmental magnetic field intensity is not enough to influence the detection result of the vehicle detection device, namely the environmental magnetic field intensity is far smaller than the minimum trigger magnetic field of the ground induction coil 1, the vehicle detector 2 controls the magnetic field sensor 10 to sleep. When the triggering device 3 is triggered by the vehicle, the vehicle detector 2 controls the ground induction coil 1 to start working, and the vehicle detection device works in a normal mode.

If the environmental magnetic field intensity is enough to influence the detection result of the vehicle detection device, namely the environmental magnetic field intensity is very close to a certain group of trigger magnetic field intensity, the vehicle detector 2 changes the number of turns of the ground induction coil 1, so that the trigger magnetic field of the ground induction coil 1 is obviously greater than the environmental magnetic field intensity, thereby eliminating the influence of the environmental magnetic field on the detection result and ensuring the detection accuracy. The vehicle detection device operates with the currently selected number of turns.

Therefore, the self-adaptive adjustment of the vehicle detection device to the environment can be realized, and the application range of the vehicle detection device is expanded.

Referring to fig. 4, the triggering device 3 in this embodiment is in a bar shape, and includes an upper housing 301 and a lower housing 302, a bottom edge of the upper housing 301 is bent inward to form a curled edge 303, a top edge of the lower housing 302 is bent inward to form a curled edge 303, an annular elastic ring 306 is disposed between the upper and lower curled edges 303 along a circumferential direction of the triggering device 3, the elastic ring 306 separates the upper housing 301 and the lower housing 302 so that a vertical movement space is formed therebetween, a plurality of vertical connecting bolts 305 are disposed inside the elastic ring 306 along the circumferential direction of the triggering device 3, a lower end of each connecting bolt 305 is fixedly connected to the curled edge 303 of the lower housing 302, a through hole 304 is disposed on the curled edge 303 of the upper housing 301, an upper end of each connecting bolt 305 passes through the through hole 304, and an upper end of each connecting bolt 305 has a bolt head. The structure enables the upper shell 301 to move up and down relative to the lower shell 302, and the upper shell 301 and the lower shell 302 can not be separated.

A trigger switch 310 is mounted inside the lower housing 302, and a push rod 311 is mounted inside the upper housing 301, wherein the push rod 311 is aligned with the trigger switch 310. When the wheel presses the trigger device 3, the upper shell 301 moves downwards, the end of the push rod 311 presses the trigger switch 310, so that the trigger switch 310 is triggered to generate the trigger signal. In the process, the elastic ring 306 is compressed to store energy, when the wheel leaves the trigger device 3, the elastic ring 306 returns to the original shape, and the elastic force drives the upper shell 301 to ascend and reset.

In this embodiment, the top surface and the bottom surface of the elastic ring 306 are respectively fixed to the curled edge 303 of the upper case 301 and the curled edge 303 of the lower case 302 by waterproof glue. The elastic ring 306 can seal the space between the upper shell 301 and the lower shell 302, so as to play a role in water and dust prevention and prevent water or dust from entering the trigger device 3.

In this embodiment, an annular inner sealing ring 307 is further disposed between the elastic ring 306 and the connecting bolt 305 along the circumferential direction of the triggering device 3, and the inner sealing ring 307 has a membrane structure, and the top surface and the bottom surface thereof are hermetically bonded to the bead 303 of the upper housing 301 and the bead 303 of the lower housing 302, respectively. The inner sealing ring 307 and the elastic ring 306 form a double sealing structure, so that the triggering device 3 has better waterproof and dustproof effects. The membrane-type inner sealing ring 307 is unstressed and flexible, has a longer service life than the elastic ring 306, and can prevent water or dust from entering the trigger device 3 after the elastic ring 306 is aged and cracked.

In this embodiment, a first magnet 308 is further installed at the bottom of the upper housing 301, and a second magnet 309 is installed at the top of the lower housing 302, and the first magnet 308 and the second magnet 309 repel each other. The repulsive force between the first magnet 308 and the second magnet 309 can play an additional assisting role, so that the elastic loss of the elastic ring 306 after aging can be compensated, and the upper shell 301 can be ensured to be reset smoothly.

Referring to fig. 5, the vehicle detector 2 in this embodiment includes a main control module, and further includes a dial switch, a wireless communication module, a storage module, an oscillation circuit, a storage module, and a power management module. The dial switch is connected with an I/O end of the main control module, the dial switch is arranged on a shell of the vehicle detector 2, is manually operated by a user and is used for sending a level signal to the main control module by operating the dial switch, and the main control module controls the corresponding switch unit 12 to act after receiving the dial signal, so that the number of turns of the ground induction coil 1 is adjusted, and the sensitivity of the vehicle detection device is manually adjusted by the user; the wireless communication module is connected with a communication serial port of the main control module and is used for wireless communication and data transmission between the main control vehicle detector 2 and an upper computer, and the wiring of the system can be reduced and the workload is simplified by adopting a wireless communication mode; the storage module is connected with the data read-write end of the main control module and is used for storing the calibrated magnetic field intensity data and temporarily storing the detection result data; the signal output end of the oscillating circuit is connected with the sampling signal input end of the main control module, the ground induction coil 1 is connected into the oscillating circuit through the switch unit 12, the signal output end of the magnetic field sensor 10 is connected with the sampling signal input end of the main control module, the trigger switch 310 is connected with the I/O end of the main control module, and the signal output ends of the first sensor 5 and the second sensor 7 are both connected with the sampling signal input end of the main control module; the output end of the power management module is connected with the main control module, each module and components and parts and used for supplying power to the whole vehicle detection device, the control signal output end of the main control module is connected with the control end of the power management module and used for controlling each path of power signal output by the power management module, and the working states of the ground induction coil 1 and each sensor are controlled by controlling each path of power signal.

Example two:

a wireless ground-sensing vehicle detection method, comprising the steps of:

s1, arranging a trigger device in front of the ground induction coil, and arranging a first detector behind the ground induction coil;

s2, when the trigger device is triggered by the vehicle, the ground induction coil is started to detect the vehicle; when a vehicle passes through the ground induction coil, the triggering device is triggered again, the first vehicle detector is started, and the number of the vehicles is detected through the first detector;

and S3, when the trigger device is not triggered again after a period of time, the control ground induction coil stops working.

In this embodiment, in step S1, a second probe is further provided behind the first probe; in S2, when the vehicle passes through the ground induction coil, the triggering device is triggered again, the first detector and the second detector are activated, the number of vehicles is detected by the first detector, and the moving speed of the vehicle and the length of the vehicle are calculated according to the distance between the first detector and the second detector and the time point when the vehicle passes through the first detector and the second detector.

In this embodiment, after the trigger device is disposed in front of the ground sensing coil and the detector is disposed behind the ground sensing coil, the magnetic field strength of the environment around the ground sensing coil is detected, and the detection result is compared with the trigger magnetic field strength of the ground sensing coil with different turns calibrated in advance.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.